. >> she wants to know why police didn't use greater care and caution. san mateo police describe a situation far more dire. they say robert karen brought a gun into the cvs pharmacy. running to his home blocks away. >> everybody knows. the police know. they have to pay. to pay what? i never pay, okay, and he got very upset, came home, and they send the police here. >> address on the prescription bottle led police right to karen, who they knew because of a violent past. >> it was fairly extensive and it involved behavior such that there was a notice on record. >> which means that officers should use extra caution, but police say when they arrived on oak street. >> suspect pointed a handgun directly at the officer and fired upon them. >> he missed, so the two officers chase into the backyard where karen pointed the gun again, but the officers didn't miss. karen was killed instantly. police say an investigation is underway. but, they've already recovered the gun. >> so there were expended casings within that gun. >> robert lyles, cbs 5. >> public employees